Algae Flashcards
Kingdom:
Protista
Nutritional type:
Photoautotroph
Multicellularity:
Some
Food acquisition method:
Absorptive
Cellular arrangement:
Unicellular, colonial, filamentous, tissues
Characteristic features:
Sexual and asexual spores
Embryo formation:
None
single-celled synchronized swimmer
Volvox
the body of a multicellular alga
Thallus
branched; anchor the alga to a substrate
holdfasts
stemlike and often hollow that connects the blade to the holdfast not lignified or woody, so it does not offer the support of a plant’s stem; instead, the
surrounding water supports the algal thallus
stipes
leaflike
blades
floating, gas-filled bladder that buoys some algae
Pneumatocyst
a brown alga.
Macrocystis porifera,
a red alga.
Microcladia,
The delicately branched red algae get their color from
phycobiliprotein accessory pigments.
Mulঞcellular algae with thalli and filamentous forms can fragment; each piece is capable of forming
a new thallus or filament.
All algae can reproduce asexually. (true or false)
True
When a unicellular alga divides,
its nucleus divides (mitosis),
Some algae can reproduce sexually. (true or false)
true
are therefore found throughout the ______ zone bodies of water.
photic (light)
Algae are what? (Nutrition)
photoautotrophs
used to induce vaginal dilation before surgical entry into the uterus through the vagina
Laminaria japonica
macroscopic; some reach lengths of 50 m; used in the production of algin and variety of non-food goods
Brown Algae (or kelp)
are used for food; some member, however, can produce a lethal toxin
Gracilaria
have delicately branched thalli; can live at greater ocean depths than other algae used to extract agar (used in microbiological media) and carrageenan as thickening ingredient in evaporated milk, ice cream, and pharmaceutical agents
Red Algae
have cellulose cell walls; contain chlorophyll a and b; store starch most are microscopic, although they may be either unicellular or multicellular
Green Algae
unicellular or filamentous algae with complex cell walls that consist of pectin and a layer of silica; the two parts of the wall fit together like the halves of a Petri dish; store energy captured through photosynthesis in the form of oil
Diatom
diatom produces domoic acid which?
a neurotoxin that causes amnesic shellfish poisoning;
when was the first reported outbreak of a neurological disease caused by diatoms in Canada
1987
a neurotoxin that causes amnesic shellfish poisoning
domoic acid
unicellular algae collectively called plankton; has rigid structure due to cellulose embedded in the plasma membrane
Dinoflagellates
produces neurotoxins:
Dinoflagellates
Karenia brevis produce that causes massive fish kills
brevetoxins
genus ________, in large concentrations give the ocean a deep red color
Alexandrium
causes paralytic shellfish poisoning (PSP);
saxitoxins
Gambierdiscus toxicus produces ciguatoxin that causes
ciguatera
Seasonal changes in nutrients, light, and temperature cause fluctuations in algal populations; periodic increases in numbers of planktonic algae are called
algal blooms.
are responsible for seasonal red tides.
Blooms of dinoflagellates
was formed from diatoms and other planktonic organisms that lived several million years ago.
Petroleum
Many unicellular algae are symbionts in animals. (true or false)
true
